Thomas shaw



uiten jtatrs atrnt @time IMPROVEMENT IN STEAM WHISTLS.

' @in rlntnlt nicht in in' iigrst httnfs lhrimt mit uniting and nf tige smut.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, THOMAS SHAW, of thecity and county of Philadelphia, Pennsylvanim-have invented a new and improved mode of constructing Whistles; and I hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the letters of refer. ence marked thereon. i

y My invention consists in the employment of hollow tubes in the manner and for the purpose as hereafter described, and is particularly applicable to gauge-cocks, as an attachment to indicate the passage4 of water or steam by sound. v i

In order to enable others to use and practise my invention, I will proceed to describe its construction and operation. On reference to the accompanying drawing, which forms a part of the specication- Figure represents an exterior View of the whistle; and

Figure 1 a longitudinal vertical section through the centre of the same, of which a is aplane tube provided with a screw-thread at one end, b, and closed entirely or partially at the other end c, and is also provided with a partition, d, apertures e andf, all for the purpose as hereafter described. Said tube a is covered for a part of its length with tube g, which is secured to tube a at 7L by solder o r other suitable means. Said tubeg is enough larger in diameter than tube a tb form an annular recess between "the same for the purpose' of leading steam or air, forced through apertures e, into the air, as hereafter described.

The instrument iscaused to give synchronous vibrations to the air in this wise: When steam or air is forced into tube a at b, it meets an obstruction in partition cl, which causes the current to ow through apertures e into the annular recess intervening the tubes, from which it ioxrs in a stream (of shape of annular recess at over aperturesf, causing rapid Vibrations in the air, by reason of the friction at the point of expositionfot air contained in tube a. Said friction produces synchronous "vibrations in the air more or less long, in proportion to eapacityof tube a, size of aperturesf, and swiftness of `the passing current7 their proper combinations producing high or low notes at will, forming a cheap and efficient whistle, not affected by slight alteration; as, for

instance, diameter of tubes, size and number of apertures, which can be altered without any other result than alteration in the tone.

Claim.

What I claim, and desire to secure by Letters Patent, is The combination of tubes a and g, asset forth in combination with the apertures f, for the purpose specified.

THOMAS SHAW. [L 5.1

Witnesses:

J. R. MAssEY, ELIAS J. SHAW. 

